Damper and process thereof

ABSTRACT

A fitting type damper and a process thereof being capable of increasing largely slipping torque in strength are ones that the large slipping torque can be increased not only when the damper is a new product but also after a heat aging test and/or a durability test are performed. And, the damper is one that γ-mercaptopropyltrimethoxysilane  4 , which is an organosilane used as a non-slip agent, is adhered and fitted between a hub  1  formed by some metal parts and a rubber elastic body  3 , and between a inertia mass body  2  formed by some metal parts and the rubber elastic body  3.

TECHNICAL FIELD

The present invention relates to a damper, and in particular to atorsional damper that absorbs twisting vibration generated in a rotationdriving system such as a crankshaft of an internal combustion engine.

BACKGROUND ART

As this type damper, the followings have been hitherto suggested: (1) anadhesion type damper wherein a rubber elastic body is vulcanized andadhered between a sleeve and a inertia mass body and a hub ispress-fitted inside the sleeve; (2) an adhesion type damper wherein,after an adhesive agent is applied to both surfaces of the a sleeve anda inertia mass body, a vulcanized and molded rubber elastic body ispress-fitted between the hub and the inertia mass body; (3) an adhesiontype damper obtained by filling non-vulcanized rubber between a hub anda inertia mass body and then vulcanizing and adhering thisnon-vulcanized rubber; (4) a fitting (non-adhesion) type damper whereina vulcanized and molded rubber elastic body is press-fitted between ahub and a inertia mass body; and so on.

In a fitting type damper, a polymer elastic body for connecting a huband a inertia mass body to each other is generally fitted in acompressed state. Therefore, the fitting type damper is known in that aprocess thereof is simpler and the durability thereof is higher than anadhesion type damper. On the other hand, when high load is applied tothe fitting type damper, slipping in a rotary direction is often causedbetween the hub formed by metal parts and the rubber elastic body orbetween their inertia mass body formed by metal parts and the rubberelastic body.

Recently, therefore, for the fitting type damper the followings havebeen suggested to prevent this slip and to increase (improve) slippingtorque: (5) a method of subjecting a fitting surface of a hub or ainertia mass body to shot blast treatment; (6) a method of givingadhesiveness to a rubber elastic body itself; (7) and a method ofinterposing polymethylene polyphenyl polyisocyanate on an interfacebetween a hub and a rubber elastic body or between a inertia mass bodyand a rubber elastic body.

As a damper for realizing high durability and high slipping torque,there is a damper which is a fitting and adhesive type. The process ofthis damper comprises: a first step of applying an adhesive agent torespective surfaces of a hub and/or a inertia mass body so as to face arubber; a second step of drying the applied adhesive agent; a third stepof applying press-fitting liquid such as oil onto the dried adhesiveagent; a fourth step of press-fitting a another vulcanized rubberbetween the hub and the inertia mass body; a fifth step of removing anexcess amount of press-fitting liquid; and a sixth step of heating theassembled damper to adhere the hub and/or the inertia mass body to theanother rubber.

Japanese Patent Laid-open No. 2-85543 discloses a structure in which ainertia mass body and a rubber elastic body are jointed with a silanetype adhesive agent to improve heat resistance of the rubber elasticbody for use of a dynamic damper. In Examples thereof, as examples ofthe rubber elastic body having heat resistance, an ethylene acrylicrubber and acrylonitril rubber are described, and as an example of thesilane type adhesive agent, Y-4310 (which is trade name and is made byLord Corporation) is described.

About a conventional fitting type damper subjected to shot blasttreatment, the process thereof is simple but high slipping torque cannotbe obtained.

About the conventional fitting type damper which has adhesiveness onsurfaces of the rubber elastic body thereof, durability thereof isreduced and the process thereof is complicated. Moreover, press-fittingof conventional fitting type damper is difficult.

About the conventional fitting type damper in which polymethylenepolyphenyl polyisocyanate is interposed, the following steps arenecessary to make fitting easy: an applying step of applyingpress-fitting oil to a fitting surface of a hub or a inertia mass bodyand a washing step of removing this press-fitting oil after beingfitted. Therefore, number of the process steps increases. Since theconventional fitting type damper has toxicity, problems about safetythereof arise, so that cost of manufacturing the damper rises.

About the conventional post-adhesion type damper obtained by applying anadhesive agent to a hub and a massive body and by press-fitting anothervulcanized and molded rubber after carrying out heating and adhesion,the step of applying and drying the adhesive agent and the washing stepof removing press-fitting oil are necessary. Therefore, number of theprocess steps increases. When the another rubber is press-fitted, byfriction between a surface of the another rubber and an adhesive agentlayer formed on a surface of metal fittings for fixing the anotherrubber, the adhesive agent layer may be partially sliced off, so thatadhesion unevenness is easily caused.

Accordingly, the conventional fitting type dampers have above-mentionedvarious drawbacks.

An object of the present invention is to provide a fitting type dampermaking it possible to increase slipping torque highly, and in particulara fitting type damper capable of having a large slipping torque not onlywhen the damper is new but also after both a heat aging test and adurability test are performed, and to provide a process of the fittingtype damper.

DISCLOSURE OF THE INVENTION

The inventor has found that by selecting an organosilane as a non-slipagent provided between a hub formed by metal parts and a polymer elasticbody, and/or a massive body formed by metal parts and the polymerelastic body, solution of the organosilane can be used as press-fittingliquid when the polymer elastic body is press-fitted between the hub andthe inertia mass body, and the organosilane can be used in common forthe non-slip agent and the press-fitting liquid.

Moreover, during investigation of detailed mechanism thereof, theinventor has found that according to the present invention, a surface ofthe hub or the inertia mass body, the surface facing and being providedwith the polymer elastic body, has sufficient adhesive power to beobtained without providing a coat for improving rust prevention and/oradhesiveness, such as a metal plating layer or chromate treatment, thatis, without performing any chemical surface treatment.

Regarding a surface facing and being providing with the polymer elasticbody in the hub or the inertia mass body, and a surface facing and beingproviding with the hub or the inertia mass body in the polymer elasticbody, reactive groups existing between the one metal surface of thepolymer elastic body and the organosilane on the surface of the polymerelastic body easily react with the organosilane, so that chemicaladhesive mechanism is created and thereby adhesive power therebetween isobtained. On the other hand, as there is no chemical surface treatmentbetween the other metal surface of the hub and the inertia mass body andthe organosilane, the other metal surface being without performingchemical surface treatment easily generates rust or the like thereon, sothat it is difficult to cause stable chemical surface treatment andthereby to obtain sufficient adhesive power. It Is however presumed thatsufficient physical adhesive mechanism to compensate for the chemicaladhesive mechanism is formed between the above-mentioned metal surfaceand the organosilane and thereby sufficient adhesive power is caused.

It can be considered that from a microscopic viewpoint, a great deal ofunevenness is generated in the metal surface subjected to no chemicalsurface treatment. It can be considered that since the organosilanecontacts and adheres to the unevenness, the adhering organosilane andthe unevenness of the metal surface are in the state that both arefitted to each other and, that is, this fitting power for fitting bothto each other acts as physical adhesive power.

Thus, in this physical adhesive mechanism, the adhesive power becomeslarger as the surface roughness of the metal surface becomes larger.However, if the surface roughness becomes too large, the polymer elasticbody can not adapt the unevenness of the metal surface. Therefore, theorganosilane put between the polymer elastic body and the metal surfacebecomes very uneven in thickness, so that an effective area for beingcapable of generating effective adhesive power is reduced. Thus, theadhesive power drops. To increase the adhesive power in strength, thesurface roughness of the metal surface is performed by machining or thelike. If the surface roughness is within a range of 5 to 50 μmRz (JISB0601) at ten-points average roughness, stable and strong adhesive powerthereof can be obtained, so that the range is particular preferable.

In other words, if the surface roughness is below 5 μmRz, sufficientphysical adhesive mechanism to compensate for the chemical adhesivemechanism cannot be generated. If the roughness is over 50 μmRz, theeffective area of the metal surface decreases, so that the adhesive,power is reduced.

The above-mentioned chemical surface treatment means plating treatmentfor depositing another layer on a surface or forming treatment forcontrolling surface activity, or the like.

In the damper of the present invention, since the organosilane is putbetween the polymer elastic body and the metal surface, the physicaladhesive mechanism is formed therebetween as described above. When thedamper is used, even if high torque is irregularly applied to the damperto cause a slip between the polymer elastic body and the metal surface,function of the physical adhesive mechanism can be restored to somedegree in comparison with a bond between the polymer elastic body andthe metal surface. Therefore, there is a low possibility that all thefunctions of the physical adhesive mechanism are lost at once by inputof excessive torque. It is considered that this is because even if theuneven surface in the fitted state is somewhat slid, the uneven surfaceis fitted to the organosilane again, to some extent, at the slidposition.

The present invention is a damper being a fitting type including a hub,a inertia mass body, and a polymer elastic body such a rubberpress-fitted between the hub and the inertia mass body from an axisdirection thereof, characterized in that an organosilane as a non-slipagent is provided at least one of between said hub formed by a metalmember and said polymer elastic body and between said inertia mass bodyformed by a metal member and said polymer elastic body.

At least one of a metal surface adhering the polymer elastic body insaid hub and a metal surface adhering to the polymer elastic body insaid inertia mass body is without performing chemical surface treatment.Surface roughness in at least of one of a metal surface adhering to thepolymer elastic body in said hub and a metal surface adhering to thepolymer elastic body in said inertia mass body is within a range of 5 to50 μmRz (JIS B0601).

The present invention is a process of a damper being a fitting typeincluding a hub, a inertia mass body, and a polymer elastic body such arubber press-fitted between the hub and the inertia mass body from anaxis direction thereof, the process comprising: a first step of applyingan organosilane solution as a non-slip agent onto at least one of bothsurfaces of said hub and said inertia mass body, both surfaces facingthe polymer elastic body; a second step of press-fitting the polymerelastic body applied onto the organosilane solution between the hub andthe inertia mass body; and a third step of heating the damper to removea solvent thereof, reacting the organosilane in the surface of saidpolymer elastic body and at least one of both surface of said hub andsaid inertia mass body, and attaching and fitting said hub and saidinertia mass body.

The present invention is a process of a damper being a fitting typeincluding a hub, a inertia mass body, and a polymer elastic body such arubber press-fitted between the hub and the inertia mass body from anaxis direction thereof, the process comprising: a first step of applyingan organosilane solution as a non-slip agent onto at least one of bothsurfaces of said hub and said inertia mass body, said both surfacesbeing faced by respective surfaces of said polymer elastic body; asecond step of press-fitting said polymer elastic body between said huband said inertia mass body after said first step, and a third step ofheating the damper to remove a solvent thereof, reacting theorganosilane in the surface of said polymer elastic body and at leastone of both surface of said hub and said inertia mass body, andattaching and fitting said hub and said inertia mass body.

In either of the above-mentioned processes of a damper, at least one ofboth surfaces of said hub and said inertia mass body being attached andfitted to said organosilane, said both surfaces facing said polymerelastic body is Without performing heat surface treatment. Surfaceroughness in at least of one of a metal surface adhering to the polymerelastic body in said hub and a metal surface adhering to the polymerelastic body in said inertia mass body is within a range of 5 to 50 μmRz(JIS B0601).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross section showing an embodiment of a fitting type damperaccording to the present invention.

FIG. 2 is a partially cross section of the damper shown in FIG. 1.

FIG. 3 is an explanatory sectional view showing a slipping torque testtool and a test damper.

FIG. 4 is a graph showing relationship between metal surface roughnessesand slipping torque.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a cross section showing an embodiment of a fitting type damperaccording to the present invention. FIG. 2 is a partially cross sectionof the damper shown in FIG. 1. In these drawings, reference number 1denotes a hub. This hub 1 is made of a given metal and has a ring form.The hub 1 is attached to an outer periphery of an end of a crankshaft(not shown) in an internal combustion engine such as an automobileengine or the like. A metal surface of the outer periphery of the hub 1is subjected to no chemical surface treatment such as plating treatment.

Reference number 2 denotes a inertia mass body, and this inertia massbody 2 is made of a given metal and has a ring form. The inertia massbody 2 is arranged at an outer peripheral side of the hub 1 andconcentrically with the hub 1 and is spaced from the hub 1. A metalsurface of an inner periphery of the inertia mass body 2 is notsubjected to chemical surface treatment such as plating treatment or thelike, either.

Reference number 3 denotes a rubber elastic body formed in a ring shape.This rubber elastic body 3 is press-fitted between the hub 1 and theinertia mass body 2 through a Silane compound described below. Thisrubber elastic body 3 has a predetermined press-fitting margin. However,when high load is applied to the rubber elastic body 3, the rubberelastic body 3 causes a slip in a rotary direction thereof, and the slipcan not be prevented only by this press-fitting margin.

Reference number 4 denotes, for example,γ-mercaptopropyltrimethoxysilane as an organosilane. Thisγ-mercaptopropyltrimethoxysilane 4 adheres to respective interfacesbetween the hub 1 and the rubber elastic body 3, and between the rubberelastic body 3 and the inertia mass body 2.

A pulley groove 2A is provided at an outer peripheral side of theinertia mass body 2 to transmit rotary torque to various types ofauxiliary devices (not shown).

In the fitting type damper having the above-mentioned structure,γ-mercaptopropyltrimethoxysilane 4, which is an organosilane as anon-slip agent, is provided between the hub 1 formed by some metal partsand the rubber elastic body 3, and between the inertia mass body 2formed by some metal parts and the rubber elastic body 3, so thatslipping torque (limiting torque so that a slip is caused) can belargely increased.

The following will describe a process for producing the fitting typedamper having the above-mentioned structure.

First, γ-mercaptopropyltrimethoxysilane 4, which is an organosilane as anon-slip agent, is dissolved into a solvent such as toluene to prepare aγ-mercaptopropyltrimethoxysilane solution.

This γ-mercaptopropyltrimethoxysilane solution is applied onto bothsurfaces of the rubber elastic body 3. This rubber elastic body 3 ontowhich the γ-mercaptopropyltrimethoxysilane solution is applied ispress-fitted between the hub 1 and the inertia mass body 2.

The damper comprising the hub 1, the inertia mass body 2, and the rubberelastic body 3 onto which the γ-mercaptopropyltrimethoxysilane solutionis applied and press-fitted therebetween, is put into a thermostat, andis then heated, for example, at 120° C. for 3 hours.

Since toluene, which is the solvent of theγ-mercaptopropyltrimethoxysilane solution, is emitted and removed,γ-mercaptopropyltrimothoxysilane adheres to the hub 1 and the inertiamass body 2 by heating reaction and thereby the hub 1 and the inertiamass body 2 are liked to each other.

To check an effect of the fitting type damper having the above-mentionedstructure, evaluation tests were carried out. Each of fitting typedampers subjected to the tests has a shape as shown in FIG. 1 and anouter diameter of 163 mm.

Table 1 shows Comparative examples 1-6 corresponding to non-slip agentand Example about a non-slip agent.

TABLE 1 Physical surface Non-slip agent treatment Comparative None None(20 μmRz) Example 1 2 None Shot blast 3 Phenol type None (20 μmRz) 4Isocyanate type None (20 μmRz) 5 Pyridine type latex None (20 μmRz) 6Chlorine type treating None (20 μmRz) agent Example γ- None (20 μmRz)mercaptopropyltrimeth- oxysilane

Table 2 shows Comparative examples 1-6 and Example about Slipping torque(N·m).

TABLE 2 [Slipping Torque (N · m) between rubber and metal] After theSample After 200 hours durability Measurement New product at 120° C.test Conditions RT 100° C. RT 100° C. RT Comparative example 1 370 280270 240 320 2 420 290 300 250 330 3 500 350 410 310 430 4 430 290 320260 360 5 420 290 310 250 340 6 490 330 400 290 410 Example 1060 820 980710 1060Durability conditions: performance of 20 Hz and 1,500,000 times (atrubber temperature of 100° C.) under rubber strain of 50%, thereaftermeasurement of slipping torque.

Table 3 shows Comparative examples 1 and 2 and Example about loadsrequired at the press-fitting.

TABLE 3 Load required at Press-fitting oil the press-fitting ComparativeNone Press-fitting example 1 impossiblity Comparative Used 2.3 tfexample 2 Example None 2.7 tf

As shown in measured results of Table 2, theγ-mercaptopropyltrimethoxysilane 4, which is an organosilane as anon-slip agent, is provided between the hub formed by some metal partsand the rubber elastic body, and between the inertia mass body formed bysome metal parts and the rubber elastic body. So, it is verified thatslipping torque of respective new products can be largely increased, andheat resistance thereof is improved. It is also verified that theslipping torque can be kept large without decreasing even after a heataging test and a durability test are performed.

Next, relationship between slipping torque and surface roughness ofrespective metal surfaces of both the hub 1 and the inertia mass body 2formed by some metal parts of the damper having the above-mentionedstructure, was examined.

A pulley 2B(2) which is a inertia mass body 2 used as a metal member ofthe damper examined in the test is manufactured by: using gray cast ironFC250 material to be cast into a rough shape; cutting and treating somemetal surfaces or the like for adhering to the pulley groove 2A and apolymer elastic body to form a desired shape; and making the metalsurface of the polymer elastic body an inside diameter of 128 mm and aheight of 25 mm. In the present application, the term of “a polymerelastic body” includes a rubber elastic body and a plastic elastomerbody (an elastomer body). In a similar way, the hub 1 is manufacturedby: using the FC250 material to be cast into a rough shape; cutting andtreating some metal surfaces or the like for adhering to a boss portionand the polymer elastic body to form a desired shape; and making themetal surface of the polymer elastic body an outside diameter of 122 mmand a height of 25 mm. The respective metal surfaces of the pulley 2Band the hub 1 adhering to the polymer elastic body were adjusted bycutting speed thereof to have surface roughness of 5, 10, 15, 28, 40 and50 μmRz (JIS B0601). Thus, six kinds of test metal parts were prepared.

The polymer elastic body provided in the pulley 2B and the hub 1 ismanufactured by vulcanizing an EPDM material with a peroxide to producea rubber ring 3A formed in a ring shape and having a rubber hardness of65° Hs (JIS K6253 type A durometer), as the rubber elastic body 3.

The hub 1 and the six-kind pulleys 2B manufactured by theabove-mentioned process were degreased, washed, and dried. Apress-fitting tool was used between the pulley 2B and the hub 1 topress-fit the rubber ring 3A(3) dipping-coated with theγ-mercaptopropyltrimethoxysilane solution at a compression ratio of 40%and provided with the ring therebetween. At this time, the rubber ring3A was used under the same condition (as that of six-kind Examples).Next, by being heated at 120° C. for 3 hours in the thermostat, and thennaturally cooled, the test dampers as Examples of the present inventionare formed.

As Comparative Example, the respective metal surfaces of the pulley 2Band the hub 1, the metal surface adhering to the polymer elastic bodyand having a surface roughness of 20 μmRz (JIS B0601), were degreased,washed and then dried. The pulley 2B and the hub 1 were manufactured inthe same way as that of the Examples of the present invention. Apress-fitting tool was used between the pulley 2B and the hub 1 topress-fit the rubber ring 3A dipping-coated with a press-fitting oil andassemble the ring therebetween. At this time, the rubber ring 3A wasused under the same condition as that of the Example. Next, by beingheated at 120° C. for 3 hours in a thermostat and then naturally cooled,the test damper is formed.

In the test as shown in FIG. 3, each of the test damper was fixed on atest tooling, and then the test tool was set into an not shown testdevice to measure the slipping torque in the rotary direction of thedamper. At room temperature (RT), a side portion of the pulley 2B of thetest damper manufactured by the above-mentioned process was fixed to arotating-side fixing member 11 of the test tool by holding the sideportion of the pulley 2B with a bolt 11 a in such a manner that the sideportion of the pulley was not slid. The hub 1 was fixed to adetecting-side fixing member 12 by fastening a bolt 12 a into a screwhole provided in the hub 1. FIG. 3 is a sectional view showing an upperhalf above central line of both the test tool and the test damper.

The rotating-side fixing member 11 was fixed to an not shown drivingdevice for giving rotary power in the test device, and thedetecting-side fixing member 12 was fixed to an not shown load cell fordetecting slipping torque in the test device. The rotating-side fixingmember 11 was rotated at a rotary speed of 1.4×10⁻² rad/sec along arotary axis of the test damper. And, the detecting load cell fixed tothe detecting-side fixing member 12 measured a value of maximum torqueduring the time when a slip was caused between the pulley 2B, the hub 1,and the rubber ring 3A. Measured results are shown in Table 4 and agraph of FIG. 4. In the drawing, a circle, ∘, indicates Examples and atriangle, Δ, indicates Comparative Example as corresponding to Table 4.

TABLE 4 Slipping torque (N · m) Surface roughness Comparative (μmRz)Example Example 5 796 400 10 933 15 1029 20 1029 28 1029 40 1029 50 960

It can be understood from the graph shown in FIG, 4 that as the metalsurface roughness becomes rougher, such as 5 μm, 10 μm and 15 μm,strength of the slipping torque becomes larger such as 800 N·m, 933 N·mand 1029 N·m. However, it can be understood that the strength of theslipping torque levels off such as 1029 N·m, 1029 N·m, and 1029 N·m evenwhen the metal surface roughness becomes far larger such as 20 μm, 28 μmand 40 μm, and the strength of the slipping torque starts to decreasewhen the surface roughness becomes larger than 40 μm. FIG. 4 showsslipping torque of 960 N·m in strength at surface roughness of 50 μm.

In Comparative example, FIG. 4 shows slipping torque of 400 N·m at asurface roughness of 20 μm.

That is, as is evident from FIG. 4, the damper of the present inventionhad slipping torque about twice more than that of Comparative Example,and thereby it can be understood that the damper of Example is betterthan the press-fitting type of the prior art. The damper of this presentinvention Example was formed by making the metal surface adhering to thepolymer elastic body, surface roughness of 5 to 50 μmRz (JIS B0601)without performing chemical surface treatment on the metal surface whichadheres to the polymer elastic body and contacts to the organosilane. Itcan also be understood that high slipping torque is stably exhibited inthe range of surface roughnesses of 15 to 40 μm.

The above-mentioned Examples describe the case where the solution ofγ-mercaptopropyltrimethoxysilane 4, which was an organosilane, wasapplied onto both surfaces of the rubber elastic body 3. The inventionis not however limited thereto. It goes without saying that the solutionof γ-mercaptopropyltrimethoxysilane 4, which was an organosilane, wasapplied onto the outer peripheral surface of the ring-form hub 1 and theinner peripheral surface of the ring-form inertia mass body 2.

The above-mentioned Examples also describe the case where the solutionof γ-mercaptopropyltrimethoxysilane 4 was applied onto both surfaces ofthe rubber elastic body 3 and the case where the solution ofγ-ercaptopropyltrimethoxysilane 4 was applied onto both the outerperipheral surface of the ring-form hub 1 and the inner peripheralsurface of the ring-form inertia mass body 2. The present invention isnot however limited thereto. It goes without saying thatγ-mercaptopropyltrimethoxysilane 4 is applied.

The above description is about the structure in which the rubber elasticbody 3 used as a polymer elastic body was adhered to both the hub 1 andthe inertia mass body 2 with the organosilane, but adhesion to theorganosilane may be carried out either between the rubber elastic body 3and the hub 1, or between the rubber elastic body 3 and the inertia massbody 2.

As this organosilane, γ-mercaptopropyltrimethoxysilane was used, but theorganosilane is not limited thereto. It goes without saying that thefollowings are used: (a) vinyltris(β methoxyethoxy)silane, (b)vinyltriethoxysilane, (c) vinyltrimethoxysilane, (d)γ-(methacryloxypropyl)trimethoxysilane, (e) β-(3,4epoxycyclohexyl)ethyltrimethoxysilane. (f)γ-glycidoxypropylmethyldiethoxysilans, (g)γ-glycidoxypropylmethyldiethoxysilans, (h) N-β (aminoethyl)γ-aminopropyltrimethoxysilane, (i) N-β (aminoethyl)γ-aminopropylmethyldimethoxysilane, (j) γ-aminopropyltriethoxysilane,(k) N-phenyl-γ-aminopropyltrimethoxysilane, (l) vinyltrichlorosilane,(m) γ-chloropropyltrimethoxysilane or the like.

As the polymer elastic body, the rubber elastic body was used, but itgoes without saying that the polymer elastic body is not limitedthereto.

Industrial Applicability

As described above in detail, the present invention is suitable forusing dampers and a process thereof. The damper of the present inventionis a damper being a fitting type including a hub, a inertia mass body,and a polymer elastic body such a rubber press-fitted between the huband the inertia mass body from an axis direction thereof, wherein anorganosilane used as a non-slip agent is interposed between said hubformed by a metal member and said polymer elastic body and/or betweensaid inertia mass body formed by a metal member and said polymer elasticbody. Therefore, the damper has high adhesive power and high durability.

Since at least one of an opponent surface facing the polymer elasticbody in the hub and an opponent surface facing the polymer elastic bodyin the inertia mass body is without performing chemical surfacetreatment, the process of the damper can be simplified and cost ofmanufacturing the damper can be reduced.

By setting surface roughness of an opponent surface facing the polymerelastic body in the hub and/or an opponent surface facing the polymerelastic body in the inertia mass body within a range of 5 to 50 μmRz,the adhesive power of the damper can be strengthened.

In damper and process thereof according to the present invention, whenthe polymer elastic body is press-fitted into a gap between the hub andthe inertia mass body, an organosilane solution is used as apress-fitting liquid. Therefore, the organosilane can be certainlyinterposed between the hub and the polymer elastic body and/or betweenthe inertia mass body and the polymer elastic body. And, theorganosilane is heated to be functioned as a non-slip agent, so that thedamper can obtain certain adhesive power.

In addition, the process of the damper does not require: a step ofapplying opponent surfaces facing between the hub and the polymerelastic body and/or opponent surfaces facing between the inertia massbody and the polymer elastic body, onto the non-slip agent to form abonding layer; and a step of shaving off the bonding layer performed dueto friction which the opponent surfaces facing between the polymerelastic body and the hub and/or the opponent surfaces facing between theinertia mass body and the polymer elastic body are rubbed against eachother, when the polymer elastic body is press-fitted. Therefore, thepress has such effect that the hub and the inertia mass body can becertainly attached and fitted to each other, and thereby the damper canbe manufactured simply and at reasonable prices.

1. A damper comprising: a hub; an inertia mass body; a polymer elasticbody such a rubber press-fitted between the hub and the inertia massbody from an axis direction thereof, wherein said polymer elastic bodyis a vulcanized and molded rubber elastic body; and an organosilane as anon-slip agent is provided at least one of between said hub formed by ametal member and said polymer elastic body and between said inertia massbody formed by a metal member and said polymer elastic body; whereinsurface roughness in at least one of a metal surface adhering to thepolymer elastic body in said hub and a metal surface adhering to thepolymer elastic body in said inertia mass body is within a range of 15to 50 μmRz (JIS B0601).
 2. The damper according to claim 1, wherein atleast one of a metal surface adhering the polymer elastic body in saidhub and a metal surface adhering to the polymer elastic body in saidinertia mass body is without performing chemical surface treatment.